Old Mother Hubbard/Wellness is asking people to fill out a quick survey. If you fit their profile (they're looking for people who currently feed specific brands of food, but you don't know which one until you take the survey - I didn't qualify :( ), they'll send you food samples and a voucher for a 15lb bag of food.
http://websurveyor.net/wsb.dll/6005/omh-4000.htm Good luck!